Adolf rodig



(No Model.)

A. me.

' rnocnss 0: MANUFACTURING BIMETALLIG PLATES, SLABS, M. No. 543,192. Patented July 23, 1 895.

WIT/153s.- I i //v VIYTOR:

fj {W M Wm .ATENT QFFIGE.

YADOLF some, or LABAND, GERMANY.

PROCESS OF MANUFACTURING BIMETALLIC PLATES, SLABS, 6w.

SPECIFICATION forming part of Letters Patent No. 543,192, dated July 23, 1895.

Applicationfiled fieptemher 23, 1898. seriaimtsazvs. (No specimens.)

To ctZZ whom it may concern:

Be it known that I, ADOLF RODIG, a subject of the Kingof Saxony, residing at Laband, in the Kingdom of Prussia and German Empire, have invented new and useful Improve.-

ments in Processes of Manufacturing Bimetallic Plates, Slabs, &c., of which the following is a specification.

' metal the surface metal is cast on' to two opposite surfaces of the ingot, the operation of casting being effected in the com monly known way in ordinary chill-molds. the difierent metals are not welded together or may not be completely welded together by this casting, and as on the other hand it may be desirable to stretch the surface metal over the core metal or to cover the latter withthe surface metal by rolling before the correspondingmetals are welded together-for example, in the case of plates plated with copperit is necessary to attach temporarily the surface metal to the core metal.

My invention aims to provide an improved process for the manufacture of such plates, slabs, sheets, and similar objects from two or more metals.

To this end in carrying out the invention I provide the core metal onits upper and lower or side surfaces with provisional or temporary furrows, grooves, elevations, recesses or overhanging projections, receiving and engaging the covering metal when the latter is applied to or cast on the core. Preferably these overhanging projectionsextend longitudinally of the core and are formed near the corners thereof, adjacent to which the covering metal. is to be applied. Preferably, also, transverse grooves, furrows, recesses, or overhanging projections are provided in the core metal for engaging the covering metal when cast thereon, these projections preferably intercepting those previouslydescribed'. The applied covering metal is also formed with reciprocal provisional or temporary projections for engaging those of the core, this being ac complished when the covering is applied to the core by casting it thereon by the flowing of the cast metal into the adjacent portions of the core. After casting or applying the As on one hand surface metal onto the core so that it is engaged by the said projections, I weld the core andsurface metal together by heat and the pressure of rolling, and reduce the compound ingot to the desired form and dimensions by rolling, preferably removing after the weld ing' the portions of the metals constituting the fastening devices or interengaging parts of the two after casting, so that the resulting sheet shall be composed of "layers of uniform thickness of the diiferent metals throughout their width and length. This removal may be accomplished either during the subsequent rolling operations, as by rolling out or off the interengaging provisions, or 'in any suitable manner. 1

In the accompanying drawings, Figure l is a cross-section of a compound ingot constructed according to one form of my invention. Fig.

2 is a similar view showing another adaptation of the invention. Fig. 3 is asimilar view showing another adaptation of the invention. Fig. t isa like view showing still another adaptation,'and Fig. 5'is a corresponding view showing a further modified construction of ingot. Fig. 6 is a face view of an ingot constructed according to the preferred form of my invention, and Fig. 7 is a cross-section thereof Referring to all the drawings, let A indicate the core metal, and B B the surface metal, of a compound ingot.

According to my invention I provide overhanging projections on the core metal A for engaging and retaining the surface metal B thereon. These may be variously constructed. In the form shown in Fig. lthese projections (lettered C) consist of undercut walls at the edges of the core and flanking a central depression D. In the form shown in Fig. 2

these projections consist of overhanging shoulders G at the corners of the ingot. In the construction shown in Fig. 3these projections are formed by grooves O in the sides of the ingot. In the construction shown in Fig. 4 these projections consist of beveled walls G formed at the corners of the side walls of the ingot. in Fig.6 these projections are formed by overhanging faces C at the sides of theingot. In

In the construction shown' the construction shown in Figs. 6 and 7 these projections consist of undercut recesses 0 extending longitudinally and. laterally of the core A and of less length than the latter, three being shown at each side, whereby the displacement of either surface metal relatively to the core is prevented both longitudinally and laterally.

In carrying out my invention the furrows, grooves, recesses, or projections need not extend the entire length of the core, as in certain cases it will be sufficient to arrange them on only one or more faces of the upper or lower or side surfaces of the core, as seen in Figs. 6 and 7. Likewiseit is not necessary to join by casting the surface metal to the whole length of the ingot. It is rather sufficient in certain cases, in particular in the case of softer surface metals, to effect this casting only to the middle part of the core metal; but in order to prevent that the metal casings cast on and more firmly held by the furrows, grooves, &c., on the core piece shall be dis placed one in respect to the other. When they are introduced between the rollers of a rolling-mill, it is advisable to arrange some small transverse grooves. This, of course, is not necessary if, as shown in Figs. 6 and 7, the furrows,grooves, &c., are applied only partially and do not extend over the whole corepiece. To prevent any displacement of the casings cast on when the furrows or grooves extend in the whole length of the block it will already be sufficient to arrange, prior to the casting in the longitudinal furrows, grooves, or projections, some transverse grooves having a depth of a few millimeters, in which transverse grooves the casing metal is held fast against longitudinal displacement. The double metal ingots produced in this manner are first rolled in the usual way in closed grooves until they are formed into rough bars, and then they are stretched, either longitudinally or laterally, or both, preferably by being passed through flat rollers, so as to form plates, sheets, slabs, bands, &c. The rolling pressure with heat welds the metals together and spreads the covering metal laterally and longitudinally on the core metal while also flattening the latter. The fastening borders or furrows, 620., arranged for easting on the surface metal to the core metal ing plates, sheets, slabs, bands, and the like, 7

from two or more metals welded together, which consists in forming the core piece with temporary overhanging projections at its edges for engagingand retaining the surface .metal, then casting the surface metal on two together by heat and pressure, substantially as set forth.

2. The improved process for manufacturing plates, sheets, slabs, bands, and the like, from two or more metals, which consists in forming a core piece of one metal with tem-. porary overhanging projections at its edges extending longitudinally and transversely thereof, then casting the surface metal on two opposite surfaces of the core piece and into said projections, whereby the surface metal and core piece are held fast together by said projections against relative longitudinal or lateral movement, and then welding said metals together, substantially as set forth.

3. The improved process for manufacturing plates, sheets, slabs, bands, and the like, from two or more metals welded together, which consists in forming a core piece of one metal with temporary overhanging projections at its edges, then casting the surface metal on two opposite surfaces of said core piece and into engagement with the projections thereof, whereby said core niece and surface metals are held fast together, then rolling the compound ingot thus formed and thereby welding said metals together, and then removing the portions of said metals in engagement at said overhanging projections, substantially as setforth.

4. The improved process of manufacturing plates, sheets, and the like from two or more metals welded together, which consistsin forming a core piece of one metal with provisional overhanging projections at its edges for engaging and retaining on its surface another metal, applying to such core piece a coating of another metal with reciprocal overhanging projections at its edges engaging those of said core piece and firmly holding the two together, subjecting the compound memberthus formed to heat and pressure, rolling the resulting member to the desired thickness, and destroying the interengaging portions thereof, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ADOLF RODIG. Witnesses:

EDUARD PEITZ, GUsTAv H tiLsMANN. 

